Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Patent
1992-12-15
1994-03-22
Dean, Ralph H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
528 14, 525100, 525106, 525105, C08L 8310
Patent
active
052965740
ABSTRACT:
A method for producing, in the presence of both monomers, a block copolymer of a polymer block of a vinyl aromatic hydrocarbon (and/or a conjugated diene) and a block of polydimethysiloxane which comprises adding a vinyl aromatic hydrocarbon, an organo alkali metal promoter, hexamethylcyclotrisiloxane and a polar promoter to a solvent (or to the styrene if no solvent is to be used) at a temperature of 0.degree. to 60.degree. C., allowing the polymerization of the vinyl aromatic hydrocarbon to proceed until the color of the vinyl aromatic hydrocarbon - Li.sup.+ species which is initially produced fades, then raising the temperature to 60.degree. to 120.degree. C. wherein the hexamethylcyclotrisiloxane polymerizes at the end of the polystyrene polymer blocks and then terminating the polymerization.
REFERENCES:
patent: 3051684 (1962-08-01), Morton et al.
patent: 3483270 (1969-12-01), Bostick
patent: 3665052 (1972-05-01), Saam et al.
patent: 3691257 (1972-09-01), Kendrick
patent: 3760030 (1973-09-01), Dean
patent: 3928490 (1975-12-01), Hergenrother
patent: 4143089 (1979-03-01), Martin
patent: 4148838 (1979-04-01), Martin
patent: 4263401 (1981-04-01), Chaumont et al.
patent: 4273896 (1981-06-01), Martin
patent: 4768750 (1990-11-01), Eichenauer et al.
Polymer Letters, vol. 8, pp. 677-679, 1970.
J. C. Saam, D. J. Gordon, S. Lindsey, Macromolecules, 3 (1), pp. 1-4 (1970).
I. Jansen, G. Lohmann, K. Ruhlmann, Siloxanes with Functional Groups. V. Long-term Stabilization of Polymers. I. Preparation and Properties of Styrene-Siloxane Block Copolymers, Plaste Kautsch, 31(12), pp. 441-447.
P. Bajaj, S. K. Varshney, A. Misra, Block Copolymers of Polystyrene and Poly(Dimethyl Siloxane). I. Synthesis and Characterization, J. of Poly. Sci.: Polymer Chem. Ed., vol. 18, (1980) pp. 295-309.
Dean Ralph H.
Haas Donald F.
Shell Oil Company
LandOfFree
Method of synthesis of block copolymers of vinyl aromatic hydroc does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of synthesis of block copolymers of vinyl aromatic hydroc, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of synthesis of block copolymers of vinyl aromatic hydroc will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-437877